Michael a



(No ModeL) M. A. FOSTER.

@RATE POR STEAM BOILER FURNAGES.

Patented'Deml, 1885.

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itlrtrrn Srrrres MICHAEL A. FOSTER, OF ST. LOUIS, M

@RATE FOR STEAM ignorent ISSORI.

@Pi-CIFCATION forming part of Letters Patent No. 331,700, dated December l, 18

Application tiled May 8, 1835.

'o all wtom it may concern.-

Be it known that I, MICHAEL A. Fos-run, of the city ot' St. Louis, in the State of Mis souri, have invented a certain new and useful Improvement in Grates for Steam-Boiler Furnaces, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this speciiication, and in whicha Figure l is a vertical section of the lower part of an upright furnace, showing my improved grate in elevation. Fifi. 2 is a horizontal section of the grate, taken on line 2 2, Fig. 3, looking down. Fig. 3 is a vertical section taken on line 3 3, Fig. 2. Fig. 4c is a detail perspective View of the shaker-bar. Fig. 5 is a top view showing the vertical part of my furnace-grate applied to a horizontal grate adapted to a horizontal furnace.

My invention is an improved grate in which is combined a vertical with a horizontal part; and my invention consist-s in features of novelty hereinafter fully described, and pointed out in the claims.

Referring to the drawings, A represents the bottoni of the furnace, and B the inner and outer walls ofan upright boiler. (See Fig. l.) On the bottoni or base A of the furnace rests a horizontal grate, C, consisting, preferably, when used for upright boilers, of two concentric rings, C G2, connected by cross-bars C. The grate may be turned on its support to free it of ashes and cinders.

D represents a tube that passes up through the center of the grate C, and a conical grate or frame, I, in the middle oi' the grate (l. This grate or frame I may be turned or shaken by a lever, J, having a socket, J, that fits over the lower end ot' the tube D, and a lug, J, that fits between the cogs of a wheel, J3, on and secured to the tube. The lever is shown in position in Fig. l, and it will be seen that by moving it back and forth the grate or frame I, which is secured to and carried by the tube, will be shaken to free it of ashes and cinders. The bottom I of this vertical grate I rests in a circular rabbet-groovc, L, in the ring C of the grate C. (See Fig. 3.)

The upper part of the grate consists of up- .wardly and inwardly inclined bars M, se-

cured to the upper end of the tube D at top, and held in position lower down by rings N Serial Bro. 164,730. (No model.)

N, the ring N being connected by arms N2 to a central hub, N3, that surrounds the tube D above a hub, 0*, of the grate C.

The lower part or bottom of the grate consists of downwardly and inwardly inclined bars M', whose lower ends workin the rabbet.

O represents a tire-clay crown or cap extending horizontally from the top of this vertical grate upon every side. I prefer to make notches or grooves D in the periphery of the crown or cap for the passage of the steam that is discharged through perforations .P in the pipe or tube D, and escapes through the spaces between the bars M into the furnace to assist combustion. The steam is supplied to the tube through means of a pipe, S. The hot air from the ash-pit circulates up through the grates, passing between the ring Cl and hub C'L of the horizontal grate, and out between the bars of the vertical grate into the coinbustionchamber; and its passage is also facilitated by the notches D' in the cap. The tube preferably has perforations P' in its top, as well as lower down, for the passage ot' steam.

The lower ends of the bars of thc vertical grate, tting as they do in the rabbct-groove L of the horizontal grate, prevent the hars, in connection with the rings N IW, from being warped and drawn out of place by the heat.

The cap O prevents the fuel from pressing or lying close against the bars of the vertical grate, which would retard the passage of air and ste-ain.

In Fig. 5 the vertical grateis shown applied to a horizontal grate formed to tit a horizontal furnace.

I claim as my invention- 1. A grate comprising a horizontal portion having a hub, concentric rings or partitions, and bars connecting the rings to thehub, a vertical portion having upwardly and inwardly inclined bars, downwardly and inwardly inclined bars, a ring or partition connecting the bars, a hub, and bars connecting the ring to the hub, and a tube by which the vertical portion is rotated on the horizontal portion, substantially as set forth.

2. .A grate comprising a horizontal portion having a hub and a rabbet, avertical portion having upwardly and inwardly extending IOO bars, downwardly and inwardly extending bars supported in the rabbet, and a ring or partition connecting the bars and having a hub seating on the hub of the horizontal portion, and a tube having perforations and forining a pivot by which the vertical portion is rotated, substantially as set forth.

3. A grate comprising a horizontal portion having a hub, a vertical portion having a hub seating or supported on the hub of the horizontal portion, a tube having perforations withinthe vertical portion and perforations above the vertical portion, and means for connecting a steam-pipe with the tube, substantially as set forth.

4. A grate Comprising a horizontal portion, a vertical portion, a tube passing entirely through said portions, having perforations for the escape of steam therethrough, and the.

MICHAEL A. FOSTER.

In presence of- GEo. H. KNIGHT, SAML. KNIGHT. 

